JavaScript/jQuery PolarChart - argumentAxis.constantLines

A constant line is a straight line that can be used to display, for example, an asymptote of a graph. To display constant lines on a chart, assign an array of objects specifying the properties of each constant line to the constantLines field. It is necessary to set the value property within these objects. The other properties can be set if required.

You can customize the appearance of all the argument axis constant lines at once. For this purpose, use the argumentAxis.constantLineStyle configuration object. Note that the properties that are set within the argumentAxis.constantLine object override the corresponding properties that are set within the argumentAxis.constantLineStyle object.

This property supports the following colors:

• Hexadecimal colors
• RGB colors
• RGBA colors
• Predefined/cross-browser color names
• Predefined SVG colors
• Paint server address

The following dash styles are available:

• solid
  The border is a solid, continuous line.

• longDash
  The border is displayed using long dashes.

• dash
  The border is displayed using dashes.

• dot
  The border is displayed using dots.

• Any combination of 'longDash', 'dash' and 'dot'
  The border is displayed by repeating the specified combination. For instance, 'dashdotdash'.

Use the DashStyle enum to specify this property when the UI component is used as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control. This enum accepts the following values: Solid, LongDash, Dash, and Dot.

The axis's length is calculated based on the data range. A constant line outside the data range is not displayed. Set this property to true to extend the axis and display the constant line.

A constant line label shows information on the constant line. You can configure label appearance using the label object. Within this object, you can set font properties, a position and text using corresponding fields. In addition, you can specify the horizontal and vertical alignments for the label.

You can set the label properties for all the argument axis constant lines simultaneously. For this purpose, use the argumentAxis.constantLineStyle.label object. Note that the properties that are set within the argumentAxis.constantLine.label object override the corresponding properties that are set within the argumentAxis.constantLineStyle.label object.